In Situ-Produced Cosmogenic Nuclides and Quantification of by Lionel L. Siame, Didier L. Bourlès, Erik T. Brown

By Lionel L. Siame, Didier L. Bourlès, Erik T. Brown

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5 Nave flow (bottom) 95% cpx SI41 Last 4 M HF dissolution Piano Della Lepre 95% cpx SI43 Last 4 M HF dissolution Weighted mean# ± 1σ †10 Be measurements have been normalized to ICN standard. Be concentrations are corrected from sampling depth to calculate P10. Calculated P10 is scaled to sea level high, latitude using the Stone (2000) factors. § From Masarik (2002). # Means are calculated weighting the data over relative uncertainties. †† Calculated from K-Ar data using Equation (3). ‡‡ Calculated from K-Ar and 3Hec data combining Equations (3) and (4).

1998), Bierman et al. (1999), Marsella et al. (2000), Kaplan et al. (2001), Miller et al. (2002), Kaplan and Miller (2003); 9—Briner et al. (2003, 2005, 2006), Davis et al. (2006). Cosmogenic nuclides to Laurentide Ice Sheet history and dynamics 31 nuclide research has complemented those studies and linked offshore and onshore deglacial chronologies. Following an overview of past and ongoing cosmogenic nuclide applications, we highlight the emerging strengths and challenges of using cosmogenic nuclides to understand ice sheets.

5% of the mass, so production by O spallation should produce almost the same amount of 10Be as in SiO2. Another target must be considered. As spallogenic reactions favor product masses that are either slightly less than the target or much less, such as protons and neutrons (Gosse and Phillips, 2001), the most favorable target in carbonate is C. , 1987). 10Be is produced from C by protons mainly via the reaction 12C(p, 3p)10Be. Secondary neutrons produce 10Be from carbon via the reaction 12C(n, 2pn)10Be.

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